/* **********************************************************
 * Copyright (c) 2023 Google, Inc.  All rights reserved.
 * **********************************************************/

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of Google, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#include <string>
#include "dynamic_lib.h"

namespace dynamorio {
namespace drmemtrace {

dynamic_lib_t::dynamic_lib_t(const std::string &filename)
{
#ifdef UNIX
    handle_ = dlopen(filename.c_str(), RTLD_NOW | RTLD_LOCAL);
    if (handle_ == nullptr) {
        char *error = dlerror();
        error_string_ = std::string(error == nullptr ? "" : error);
    }
#elif WINDOWS
    handle_ = LoadLibrary(filename.c_str());
    if (handle_ == nullptr)
        error_string_ = std::to_string(GetLastError());
#endif
}

dynamic_lib_t::dynamic_lib_t(dynamic_lib_t &&lib)
{
    handle_ = lib.handle_;
    lib.handle_ = nullptr;
}

dynamic_lib_t::~dynamic_lib_t()
{
    if (handle_) {
#ifdef UNIX
        dlclose(handle_);
#elif WINDOWS
        FreeLibrary(reinterpret_cast<HMODULE>(handle_));
#endif
    }
}

dynamic_lib_t &
dynamic_lib_t::operator=(dynamic_lib_t &&lib)
{
    if (handle_) {
#ifdef UNIX
        dlclose(handle_);
#elif WINDOWS
        FreeLibrary(reinterpret_cast<HMODULE>(handle_));
#endif
    }
    handle_ = lib.handle_;
    lib.handle_ = nullptr;
    return *this;
}

std::string
dynamic_lib_t::error()
{
    return error_string_;
}

} // namespace drmemtrace
} // namespace dynamorio
